What is the compressed thickness of this head gasket?

This Cometic head gasket has a compressed operating thickness of .040 inches. This measurement is critical for ensuring the correct compression ratio and valve-to-piston clearance in your engine build.

Do I need to use any sealant with this gasket?

No, Cometic MLS head gaskets are designed to provide maximum sealing performance without the need for additional sealants. The Viton coating on the outer layers ensures a robust seal on its own.

Is this gasket suitable for all L18 Vortec engines?

This gasket is specifically designed for the GM L18 Vortec 8100 Gen-VII Big Block V8 engine and features a 4.280-inch bore. It's important to verify this bore size and engine designation match your specific application.

Specifications

Brand: Cometic Gasket
Part #: C5761-040
UPC: 191070025625

Cometic GM L18 Vortec 8100 Gen-VII Big Block V8 .040in MLS Cylinder Head Gasket - 4.280in Bore - RHS

Name: Cometic GM L18 Vortec 8100 Gen-VII Big Block V8 .040in MLS Cylinder Head Gasket - 4.280in Bore - RHS
Brand: Cometic Gasket
SKU: cometic-gasket-cometic-gm-l18-vortec-8100-gen-vii-big-block-v8-040in-mls-cylinde-t14-803597
Price: 108.99 USD
Availability: BackOrder

$108.99

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Cometic GM L18 Vortec 8100 Gen-VII Big Block V8 .040in MLS head gasket. Designed for high output engines, it offers maximum sealing performance.

Key Features

Fits 2001-2007 Chevrolet and GMC trucks and SUVs with the GM L18 Vortec 8100 Gen-VII Big Block V8 engine.
Multi-Layer Steel (MLS) construction provides increased strength and resistance to corrosion.
Outer layers are coated with heat-resistant Viton rubber for a reliable seal without additional sealants.
Features a 4.280-inch bore diameter and a compressed thickness of .040 inches.
Designed to seal effectively between aluminum and cast iron engine components.
Right-side specific gasket for proper installation.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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About this part

Product Details

If you're rebuilding the top end of your GM L18 Vortec 8100 Gen-VII Big Block V8, a solid head gasket is crucial for sealing combustion pressure and coolant. This Multi-Layer Steel (MLS) gasket from Cometic is built to handle the demands of these powerful engines, ensuring a reliable seal between the cylinder head and the block.

Cometic's MLS design uses multiple layers of stainless steel for increased strength and resistance to corrosion. The outer layers are coated with Viton, a heat-resistant rubber material that can handle harsh sealing environments and varying surface finishes, meaning you don't need additional sealants. The center layer is stainless steel and can be varied in thickness; this particular gasket has a compressed thickness of .040 inches, with a 4.280-inch bore diameter, making it suitable for specific engine builds. This gasket is designed to work with both aluminum and cast iron blocks and heads, resisting the shearing forces that can occur between dissimilar metals.

This gasket is a right-side specific unit. It's designed to fit a range of heavy-duty Chevrolet and GMC trucks and SUVs from the early 2000s, including models like the Silverado 2500 HD, Sierra 3500, and Suburban 2500. Always refer to the manufacturer's installation instructions for proper torque sequences and procedures.